parsed_expression.h

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/*
 * Copyright 2026 MusicScience37 (Kenta Kabashima)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <string>
 
#include <boost/variant.hpp>
#include <fmt/base.h>
 
#include "func_sketch/common_types.h"
 
namespace func_sketch::parser {

struct ParsedLiteral {
    Number value;
};

struct ParsedIdentifier {
    std::string name;
};
 
struct ParsedFunctionCallExpression;
struct ParsedUnaryExpression;
struct ParsedBinaryExpression;

using ParsedExpression = boost::variant<ParsedLiteral, ParsedIdentifier,
    boost::recursive_wrapper<ParsedFunctionCallExpression>,
    boost::recursive_wrapper<ParsedUnaryExpression>,
    boost::recursive_wrapper<ParsedBinaryExpression>>;

struct ParsedFunctionCallExpression {
    ParsedIdentifier function_name;

    std::vector<ParsedExpression> arguments;
};

struct ParsedUnaryExpression {
    std::string operator_str;

    ParsedExpression operand;
};

struct ParsedBinaryExpression {
    std::string operator_str;

    ParsedExpression left_operand;

    ParsedExpression right_operand;
};
 
}  // namespace func_sketch::parser
 
// Implement fmt::formatter specialization for testing.

template <>
struct fmt::formatter<func_sketch::parser::ParsedLiteral>
    : fmt::formatter<string_view> {
    auto format(const func_sketch::parser::ParsedLiteral& value,
        format_context& context) const -> format_context::iterator;
};

template <>
struct fmt::formatter<func_sketch::parser::ParsedIdentifier>
    : fmt::formatter<string_view> {
    auto format(const func_sketch::parser::ParsedIdentifier& value,
        format_context& context) const -> format_context::iterator;
};

template <>
struct fmt::formatter<func_sketch::parser::ParsedExpression>
    : fmt::formatter<string_view> {
    auto format(const func_sketch::parser::ParsedExpression& value,
        format_context& context) const -> format_context::iterator;
};

template <>
struct fmt::formatter<func_sketch::parser::ParsedFunctionCallExpression>
    : fmt::formatter<string_view> {
    auto format(const func_sketch::parser::ParsedFunctionCallExpression& value,
        format_context& context) const -> format_context::iterator;
};

template <>
struct fmt::formatter<func_sketch::parser::ParsedUnaryExpression>
    : fmt::formatter<string_view> {
    auto format(const func_sketch::parser::ParsedUnaryExpression& value,
        format_context& context) const -> format_context::iterator;
};

template <>
struct fmt::formatter<func_sketch::parser::ParsedBinaryExpression>
    : fmt::formatter<string_view> {
    auto format(const func_sketch::parser::ParsedBinaryExpression& value,
        format_context& context) const -> format_context::iterator;
};